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Porous silicon (PS) is defined as a composition of a silicon skeleton permeated by a network of pores or in other word, PS is a network of silicon nanowires and nanoholes which are formed when the crystalline silicon wafers are etched electrochemically in electrolyte solution such as hydrofluoric (HF) acid . PS shows different features in comparison to the bulk silicon such as shifting of fundamental...
A powerful tool, photopyroelectric spectroscopy, for examining the optical properties as non-radiative recombination for the semiconductor materials is used for the Y2O3 doped ZnO ceramics. The ceramic (ZnO-x, x=0.4-1.6 mol% of Y2O3) was sintered at isothermal temperature, 1175 and 1275degC for 1 hour to investigate its optical properties. The PPE spectroscopy is used to study the energy band-gap...
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